BPA could be making kids fat. Or not. That's the unsatisfying takeaway from the latest study on bisphenol A — the plastic additive that environmental groups have blamed for everything from ADHD to prostate disease. Unfortunately, the science behind those allegations isn't so clear. And the new study on obesity in children and teens is no exception. Researchers from New York University looked at BPA levels in the urine of more than 2,800 people aged 6 through 19. The team wanted to know whether those with relatively high levels of BPA were more likely to be obese.